A few years ago, they had some guy throw out the first pitch. He walked out to the Mound with a Cubs' jersey on.

He then tore off the Cubs' jersey revealing a White Sox jersey, pulled a Sox hat from his back pocket and threw the first pitch.

Ever since, the Cubs check out the clothing of the person tossing out the first pitch.

IIRC, he was a friend of a WSIer.

I've always fantasized about a scenario like this, though mine would have occurred while singing during the seventh inning stretch, similar to what Jack Buck did (see video posted elsewhere in this thread).